mate-panel Crashes occasionally within VirtualBox VM

[AdamH]

The mate-panel crashed after trying different Alert Sounds in the "Sound Effects" tab within the "Sound Preferences" section of the MATE Control Centre.

This is for Ubuntu MATE 16.04 LTS Beta 1 - running within a VirtualBox VM
(VirtualBox version 5.0.14 - host OS is Linux Mint 17.2 Cinnamon Edition 64-bit)
The VirtualBox "Guest Additions" are installed in the Ubuntu MATE VM.

MATE Panel version: 1.12.2-1

The crash appeared unexpectedly.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: mate-panel 1.12.2-1
ProcVersionSignature: User Name 4.4.0-9.24-generic 4.4.3
Uname: Linux 4.4.0-9-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CrashCounter: 1
CurrentDesktop: MATE
Date: Wed Mar 2 17:05:43 2016
ExecutablePath: /usr/bin/mate-panel
InstallationDate: Installed on 2016-02-29 (2 days ago)
InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160224)
ProcCmdline: mate-panel
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f22d0879a3a <g_slice_alloc+426>: mov (%rax),%rdx
 PC (0x7f22d0879a3a) ok
 source "(%rax)" (0x1f00000020) not located in a known VMA region (needed readable region)!
 destination "%rdx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: mate-panel
StacktraceTop:
 g_slice_alloc () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_slice_alloc0 () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_object_freeze_notify () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
Title: mate-panel crashed with SIGSEGV in g_slice_alloc()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxsf
XsessionErrors:
 mate-session[1089]: WARNING: Unable to find provider '' of required component 'dock'
 (mate-panel:1520): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
 (nm-applet:1602): Gdk-CRITICAL **: gdk_window_thaw_toplevel_updates: assertion 'window->update_and_descendants_freeze_count > 0' failed

[Apport retracing service (apport)]

StacktraceTop:
 g_slice_alloc () from /tmp/apport_sandbox_DDtGlh/lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_slice_alloc0 () from /tmp/apport_sandbox_DDtGlh/lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_object_notify_queue_freeze () from /tmp/apport_sandbox_DDtGlh/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_object_freeze_notify () from /tmp/apport_sandbox_DDtGlh/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 gtk_widget_set_style_internal (widget=0x2788500, style=0x268e420, initial_emission=0) at /build/gtk+2.0-tESQz7/gtk+2.0-2.24.29/gtk/gtkwidget.c:6981

[AdamH (adam-sundew)]

mate-panel crashed again in Ubuntu MATE 16.04 Beta 2.

This is a fresh install with all updated applied, running in a VirtualBox VM
(VirtualBox version 5.0.16), with Guest Additions installed.

[AdamH (adam-sundew)]

The crashed happened again today (30th March 2016), just after booting the VM and after the Welcome screen appeared (i.e. I wasn't doing anything in particular).

[AdamH (adam-sundew)]

The same crash happened today (5th April 2016), again just after booting the VM and the Welcome screen appears. It's now happening regularly.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Martin Wimpress  (flexiondotorg)]

Fixed in mate-panel 1.18.6-1